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authorRoland McGrath <roland@redhat.com>2008-01-30 13:30:50 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:30:50 +0100
commite1f287735c1e58c653b516931b5d3dd899edcb77 (patch)
tree1a2948cfe8ff679135971e2c573d11b847fee93d /include/asm-x86/signal.h
parentx86: single_step: share code (diff)
downloadlinux-e1f287735c1e58c653b516931b5d3dd899edcb77.tar.xz
linux-e1f287735c1e58c653b516931b5d3dd899edcb77.zip
x86 single_step: TIF_FORCED_TF
This changes the single-step support to use a new thread_info flag TIF_FORCED_TF instead of the PT_DTRACE flag in task_struct.ptrace. This keeps arch implementation uses out of this non-arch field. This changes the ptrace access to eflags to mask TF and maintain the TIF_FORCED_TF flag directly if userland sets TF, instead of relying on ptrace_signal_deliver. The 64-bit and 32-bit kernels are harmonized on this same behavior. The ptrace_signal_deliver approach works now, but this change makes the low-level register access code reliable when called from different contexts than a ptrace stop, which will be possible in the future. The 64-bit do_debug exception handler is also changed not to clear TF from user-mode registers. This matches the 32-bit kernel's behavior. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86/signal.h')
-rw-r--r--include/asm-x86/signal.h11
1 files changed, 2 insertions, 9 deletions
diff --git a/include/asm-x86/signal.h b/include/asm-x86/signal.h
index 987a422a2c78..aee7eca585ab 100644
--- a/include/asm-x86/signal.h
+++ b/include/asm-x86/signal.h
@@ -245,21 +245,14 @@ static __inline__ int sigfindinword(unsigned long word)
struct pt_regs;
-#define ptrace_signal_deliver(regs, cookie) \
- do { \
- if (current->ptrace & PT_DTRACE) { \
- current->ptrace &= ~PT_DTRACE; \
- (regs)->eflags &= ~TF_MASK; \
- } \
- } while (0)
-
#else /* __i386__ */
#undef __HAVE_ARCH_SIG_BITOPS
+#endif /* !__i386__ */
+
#define ptrace_signal_deliver(regs, cookie) do { } while (0)
-#endif /* !__i386__ */
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */